We found a bug with Mimikyu. When Mimikyu uses Substitute with Disguise up, type effectiveness doesn't work properly.
In the replay, Mimikyu's EV spread is HP252 and Defense+ 252. Raticate's and Landorus's Attack EVs are 0.
Attack 0 Landorus's U-turn VS HP Defense 252 Mimikyu = 4.9%〜6.1%
Attack...